668884923 has 48 divisors (see below), whose sum is σ = 1151434752. Its totient is φ = 366120000.

The previous prime is 668884903. The next prime is 668884939. The reversal of 668884923 is 329488866.

It is not a de Polignac number, because 668884923 - 2⁶ = 668884859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668884923.

It is not an unprimeable number, because it can be changed into a prime (668884903) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 195558 + ... + 198948.

It is an arithmetic number, because the mean of its divisors is an integer number (23988224).

Almost surely, 2^668884923 is an apocalyptic number.

668884923 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

668884923 is a deficient number, since it is larger than the sum of its proper divisors (482549829).

668884923 is a wasteful number, since it uses less digits than its factorization.

668884923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536 (or 3533 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The square root of 668884923 is about 25862.8096501521. The cubic root of 668884923 is about 874.5483047694.

The spelling of 668884923 in words is "six hundred sixty-eight million, eight hundred eighty-four thousand, nine hundred twenty-three".